Pollution status, ecological risk assessment and source identification of heavy metals in road dust from an Industrial Estate in Trinidad, West Indies

ABSTRACT

Road dust in an industrial estate could potentially contain toxic heavy metals as a result of various anthropogenic sources. This study investigated sixteen samples from various locations throughout the Point Lisas Industrial Estate in Trinidad, West Indies. Samples were acid-digested and analysed by Flame Atomic Absorption Spectroscopy, which revealed that concentrations for Cd, Cr, Cu, Mn, Ni, Pb and Zn ranged from 2.48–5.45 μg/g, 14.2–70.5 μg/g, 15.3–130 μg/g, 219–1330 μg/g, 20.0–62.1 μg/g, 43.5–113 μg/g and 105–1154 μg/g, respectively. Different methods (Geoaccumulation index, pollution index, integrated pollution index, enrichment factor and ecological risk assessment) of assessing heavy metal contamination in road dust indicated negligible to moderate degrees of pollution, in which the associated potential ecological risk was considered low. Principal component analysis (PCA) and Cluster analysis (CA) grouped the heavy metals according to potential sources and indicated that the accumulation of heavy metals in the road dust of the Estate were influenced mainly by vehicular and industrial processes.

KEYWORDS:

• Contamination assessment
• heavy metals
• industrial estate
• road dust
• Trinidad

Acknowledgement

The authors would like to thank Dr. Lebert Grierson from the Department of Chemistry, The University of the West Indies for all resources and support throughout this project.

Disclosure statement

No potential conflict of interest was reported by the authors.

Notes on contributors

Crystal Pragg is an M.Sc. student (OESH Programme) at the Department of Chemistry, Faculty of Science and Technology, The University of the West Indies, St. Augustine, Trinidad and Tobago, West Indies.

Faisal K. Mohammed is a recent Ph.D. graduate employed at the Department of Chemistry, Faculty of Science and Technology, The University of the West Indies, St. Augustine, Trinidad and Tobago, West Indies.

ORCID

Faisal K. Mohammed http://orcid.org/0000-0003-4217-4247

Additional information

Funding

This study received support from The University of the West Indies.